Nimbostratus cloud
A thick, widespread cloud layer that produces persistent rain or snow and often obscures the Sun. It commonly forms within large weather systems.
Stratiform cloud: A cloud organized in broad, horizontally layered sheets rather than isolated heaps. Nimbostratus is the precipitation-bearing form of this layered cloud structure.
Stratus cloud: A low, uniform cloud layer that can resemble fog elevated above the ground. Stratus is generally shallower and produces less substantial precipitation than nimbostratus.
Cloud: A visible mass of tiny liquid droplets, ice crystals, or both suspended in the atmosphere. Nimbostratus is a cloud type defined by its widespread layered form and precipitation.
Weather forecasting: The use of observations and atmospheric models to predict future weather conditions. A broad nimbostratus layer signals prolonged precipitation that forecasts must time and quantify.
Orographic lift: The upward movement of air forced by terrain such as a mountain range. Terrain can lift moist air into extensive layers that develop into nimbostratus.
Altostratus: A middle-level, widespread cloud layer that often covers much of the sky. Altostratus can precede nimbostratus, which is thicker and more likely to bring sustained precipitation.
Cloud genus: A primary category in the international classification of clouds, based on characteristic form and appearance. Nimbostratus is one of the ten recognized cloud genera.
Aviation meteorology: The study and forecasting of atmospheric conditions relevant to aircraft operations. Nimbostratus can bring low ceilings, poor visibility, and icing conditions.
Frontal lifting: The ascent of air as a weather front displaces warmer or less dense air. Warm air rising over a front commonly sustains the broad cloud layers.
Cumulonimbus: A towering convective cloud associated with thunderstorms and intense showers. Its localized, vigorous storms contrast with nimbostratus’s broad, persistent precipitation.